The molecules that are well recognized as biocatalysts in addition to enzymes are

Options

A. Polysaccharides
B. RNAs
C. Fatty acids
D. None of the above.

Answer

To answer the question "The molecules that are well recognized as biocatalysts in addition to enzymes are," we need to analyze the options provided and understand the role of each molecule type in biological processes.

### Step-by-Step Solution:

1. **Understanding Biocatalysts**:
- Biocatalysts are substances that accelerate chemical reactions in biological systems. The most well-known biocatalysts are enzymes, which are proteins that facilitate biochemical reactions.

2. **Evaluating the Options**:
- **Polysaccharides**: These are long-chain carbohydrates made up of monosaccharide units. They primarily serve as energy storage (like starch and glycogen) or structural components (like cellulose). They do not act as biocatalysts.
- **RNAs**: Ribonucleic acids (RNAs) can act as biocatalysts. Certain RNA molecules, known as ribozymes, have catalytic properties and can facilitate biochemical reactions, similar to enzymes. This was a significant discovery in molecular biology.
- **Fatty Acids**: These are the building blocks of lipids and play a crucial role in energy storage and cellular structure. However, they do not function as biocatalysts.

3. **Identifying the Correct Answer**:
- Given the analysis, the only option that fits the criteria of being a biocatalyst, in addition to enzymes, is **RNAs** (specifically ribozymes).

4. **Conclusion**:
- Therefore, the correct answer to the question is **option B: RNAs**.